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1.
There are both many good things and many potential dangers in social network
It's important for parents to teach their children how to use social media wisely
Social network is the start of bad things like cyberbullying
2.
A recent report has said that many teenagers have contacted online with strangers and it makes them feel scared or uncomfortable.
Others receive onine advertising that is inapproriate for their age.
It is important that parents should be aware of what children are doing online.
Parents should make their children understand that they respect children's privacy.
However, parents want to make sure that their children are safe.
Exericse V:
31. B
32.C
33.C
34.A
35.D
Exercise VI:
36. A
37. D
38. C
39. C
40. C
Exercise VIIz;
41. D. time enough \(\rightarrow\)enough time
42. C. rises \(\rightarrow\) is rising
43. C. isn't telling \(\rightarrow\) don't tell
44. C. with \(\rightarrow\) \(\varnothing\)
45. C. taller \(\rightarrow\) tallest
Exercise VIII"
46.D
47.A
48.C
49.B
50.A
cảm ơn trước 
Từng tranh theo từ trên xuống và qua rồi đó bạn ^^ hay để mình chụp từng bài gửi nha
1, A => why did you call
2, A => did
3, D => not to
4, D => had
5, C => before
1. i lived on a farm once, but don't any more
->i used to live on a farm
2. Mark is too young to ride his bike to school
->Mark isn't old enough to ride his bike to school
3. Nga enjoys listening to traditional stories
->Nga is interested in listening to traditional stories
4. let's meet at the cafe corner
->Bao suggested meeting at the cafe corner
5. Sao Mai movie theater is near Hoa's house
-> Sao Mai movie theater is not far from Hoa's house
9a
10d
11d (câu này thực tế 4 phương án đều chưa thích hợp)
12a
13a
14c
15d
Dạ em cảm ơn ạ